JP6724505B2 - Onshore power supply system for ships and power supply method for ships - Google Patents

Description

The present invention relates to a ship land power supply system for supplying power from a land to a ship that is moored, and a power supply method to the ship.

As a method of supplying power to this type of ship, when supplying power from a land to a ship that is moored at a port and has a generator inside the ship, synchronous adjustment of the power from the land and the power from the generator is performed. And the step of performing the synchronous adjustment and then performing the short-time parallel operation of the power from the land and the power from the generator. After the short-time parallel operation, shut off the power from the generator and A method of supplying power to a ship is known, which includes a step of supplying power to the ship with electric power from (for example, refer to Patent Document 1).

JP, 2005-237151, A

By the way, in the conventional power supply method to a ship described in Patent Document 1, the power for supplying the normal load from the generator to the normal load is adjusted synchronously between the power from the land and the power from the generator. In order to match, it is done manually using a voltmeter, a frequency meter, and a synchrometer. Then, after the synchronous adjustment is completed, short-time parallel operation of the electric power from the land and the electric power from the generator is performed.
Therefore, in the above-mentioned conventional example, it takes a long time to perform the synchronous adjustment, the burden on the worker is great, and the voltage and the phase of the power from the land and the power from the generator cannot be perfectly matched, and the phase and There is a problem that there is a high possibility that a disturbance due to an inrush current will occur due to an error in voltage due to an inrush current.

Therefore, the present invention has been made by paying attention to the problem of the conventional example described in Patent Document 1 described above, and ensures reliable synchronization between the onshore power and the inboard power to perform power switching without causing disturbance. An object of the present invention is to provide a land power supply system for a ship and a power supply method for the ship that can be performed.

In order to achieve the above object, one aspect of a land power supply system for a ship according to the present invention is a plurality of ship power supply control units that convert system AC power input from a land system power supply into ship AC power, and a marine vessel power supply unit for supplying via a cable marine AC power outputted from the plurality of marine vessel power supply control unit to the marine vessel in the system power supply of the ship at anchor, respectively the marine vessel power supply control unit, a power converter for converting line AC power input to the marine AC power, so that the power is the voltage and phase of the marine AC power output from the converter unit is aligned with the voltage and phase of the AC power in a ship And a synchronous adjustment control unit for synchronously controlling the power conversion unit, and when the synchronous adjustment control of the synchronous adjustment control unit is completed, the load conversion from the in-ship system power source is performed while the power conversion unit is droop-controlled. And a droop control unit.

Further, in one aspect of a method for supplying power to a ship according to the present invention, an input side is connected to a land system power supply via an input circuit breaker, and an output side is connected to a ship system power supply via an output circuit breaker and a ship power supply unit. A plurality of ship power supply control units that convert system AC power into ship AC power are connected in parallel, and each ship power supply control unit includes a power conversion unit that converts system AC power into ship AC power; An output side switch connected to the output side of the power conversion unit, connecting the ship power supply unit to an in-ship system power supply of the ship at berth via a cable, and the output side switch in an open state In this state, the step of closing the input circuit breaker and the output circuit breaker, the ship AC voltage output from the power conversion unit of the output side switch, and the input from the ship of the output side switch. Detecting the AC voltage inside the ship, and synchronously adjusting and controlling the power converter so that the voltage and phase of the AC power for the ship match the voltage and phase of the AC power inside the ship input from the ship. , When the synchronous adjustment of the voltage and the phase by the synchronous adjustment control is completed, the output side switch is closed and then the droop characteristics of the ship power source control units are aligned with the power conversion unit. performing a suppressing loop control lateral flow between use power control unit, the successively reducing the load sharing of the ship in the system power source and a step of blocking the vessel in the system power source.

According to one aspect of the present invention, the voltage and phase of the inboard AC power are detected, and the AC power for ships generated from the onshore system power supply is synchronized and controlled to match the detected voltage and phase of the inboard AC power. Therefore, the marine AC power can be accurately matched with the marine AC power, and the marine AC power can be switched to the marine AC power without causing any disturbance.

It is a circuit diagram which shows 1st Embodiment of the land power supply system for ships which concerns on this invention. It is a simplified circuit diagram for explaining an example of droop control. It is a characteristic diagram which shows the reactive current of output voltage droop control, and the relationship between output voltage. It is a characteristic diagram which shows the relationship between the effective current of output frequency droop control, and output frequency. It is a flow chart for explaining a power supply method for a ship. It is a flow chart for explaining a method of stopping power supply to a ship. It is a circuit diagram which shows 2nd Embodiment of the land power supply system for ships which concerns on this invention. It is a circuit diagram which shows the unit inverter in 2nd Embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts.
Further, the embodiments described below exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, The layout is not specified as below. Various changes can be added to the technical idea of the present invention within the technical scope defined by the claims described in the claims.
Hereinafter, a land power supply system for a ship according to an embodiment of the present invention will be described with reference to the drawings.

The onshore power supply system 10 for a ship is arranged at a wharf where a ship berths. As shown in FIG. 1, the onshore power supply system 10 for a ship includes an input circuit breaker 12, an input side transformer 13, a plurality of, for example, five ship power supply control units 14A to 14E connected in parallel, an output side transformer 15, The output circuit breaker 16 and the ship power supply unit 17 are connected in series.
The input circuit breaker 12 is connected to a land system power supply 11 that supplies system AC power having a voltage of 10 kV and a frequency of 50 Hz, for example. The input circuit breaker 12 is controlled to be opened/closed by a system controller 18, which is a programmable controller (PLC) for overall control of the marine shore power supply system 10.

The input side transformer 13 has a primary side winding connected to the input circuit breaker 12, and a secondary side winding connected to the marine vessel power supply control units 14A to 14E. The input-side transformer 13 steps down the three-phase high-voltage system AC power input from the system power supply 11 and supplies it to the low-voltage ship power supply control units 14A to 14E.
The output side transformer 15 has a primary side winding connected to the ship power supply control units 14A to 14E, and a secondary side winding connected to the output breaker 16. This output-side transformer 15 boosts the three-phase marine vessel AC voltage output from the marine vessel power supply control units 14A to 14E and supplies it to the output circuit breaker 16, and reduces the marine vessel AC power for marine vessel use. It is supplied to the power supply control units 14A to 14E.

The output circuit breaker 16 is connected between the output side transformer 15 and the ship power supply unit 17. The output circuit breaker 16 is controlled to open and close by the system controller 18 like the input circuit breaker 12.
The power supply unit 17 for a ship is arranged on a wharf where a ship berths and is connected to a system power supply in a ship via a cable. Here, a system power supply in a ship is equipped with a plurality of generators in a large ship, and supplies system power to a propulsion auxiliary machine load such as a bow thruster of a ship, a cargo handling load such as a cold storage, and a normal load such as an electric light. ing. The propulsion auxiliary equipment load is used during propulsion, at the time of berthing, and at the time of leaving the shore, but is not used while moored.

The configuration of the ship power supply control units 14A to 14E will be described with the ship power supply control unit 14A as a representative. The ship power supply control unit 14A includes an input side processing unit 20 and an output side processing unit 21.
The input side processing unit 20 includes input terminals tiu to tiw, input side fuses Fiu to Fiw, input side switches SWiu to SWiw, an input side noise filter circuit 22, and a first power conversion unit 23 which are connected in series. .. The input-side processing unit 20 also includes an initial charging circuit 24 connected in parallel with the input-side switches SWiu to SWiw and the input-side noise filter 22.

The input-side switches SWiu to SWiw are controlled to open/close by the system controller 18.
The input-side noise filter circuit 22 has two reactors L1 and L2 connected in series to each of the U-phase line Lu, the V-phase line Lv, and the W-phase line, and one end at a connection point between these reactors L1 and L2. The switches SWfu to SWfw, which are connected to each other, have the other ends connected to one ends of the resistors Ru to Rw, the capacitor C0 connected between the other ends of the resistors Ru and Rw, and the other ends of the resistors Ru and Rv. The capacitor C1 and the capacitor C2 connected between the other ends of the resistors Rv and Rw constitute an LCR filter. Here, the switches SWfu to SWfw are controlled to be opened and closed by the system controller 18.

The first power conversion unit 23 is composed of a forward converter that converts low-voltage AC power input through the input-side noise filter circuit 22 into DC power, and includes six switching elements and a freewheeling diode connected in anti-parallel thereto. A bridge circuit is formed, and a smoothing capacitor Cc is connected to the output side. The switching of the first power converter 23 is controlled by the internal controller 25. A diode bridge circuit may be applied instead of the switching element. In this case, the internal controller 25 can be omitted.
The initial charging circuit 24 is configured by a series circuit of resistors Rcu to Rcw and switches SWcu to SWcu, and the switches SWcu to SWcw are controlled to be opened and closed by the system controller 18.

The output processing unit 21 includes a second power conversion unit 26 connected in series with the first power conversion unit 23, an output noise filter circuit 27, output switches SWou to SWow, output fuses Fou to Fow, and an output terminal. It has tou to tow.
The second power conversion unit 26 converts the DC power output from the first power conversion unit 23 into marine AC power, and, for example, two switching devices in which diodes are connected in antiparallel are connected in series two by two. It has a configuration in which three arms connected to each other are connected in parallel. Then, three-phase marine vessel AC power is output from the connection midpoint of each arm. The switching of each switching element of the second power conversion unit 26 is controlled by the internal controller 28. The first power converter 23 and the second power converter 26 constitute a power converter.

The output-side noise filter circuit 27 has two reactors L1 and L2 connected in series to each of the U-phase line Lu, the V-phase line Lv, and the W-phase line, and one end at a connection point between these reactors L1 and L2. The switches SWfu to SWfw, which are connected to each other, have the other ends connected to one ends of the resistors Ru to Rw, the capacitor C0 connected between the other ends of the resistors Ru and Rw, and the other ends of the resistors Ru and Rv. The capacitor C1 and the capacitor C2 connected between the other ends of the resistors Rv and Rw constitute an LCR filter. Here, the switches SWfu to SWfw are controlled to be opened/closed by the system controller 18.

Further, on the second power conversion unit 26 side of the output side switches SWou to SWow, a first voltage detection unit 29 that detects the voltage of the marine AC power output from the second power conversion unit 26 is provided for the instrument transformer ( PT). Further, the output side switches SWou to SWo are connected at their output terminals tou to tow side with a second voltage detection unit 31 for detecting the voltage of the electric power in the ship via an instrument transformer (PT) 32. Then, the voltage of the ship AC power detected by the first voltage detector 29 and the voltage of the ship AC power detected by the second voltage detector 31 are input to the AD conversion input terminal of the internal controller 28. ..

The internal controller 28 includes a synchronization adjustment controller 28a and a droop controller 28b. The synchronization adjustment control unit 28a calculates a synchronization adjustment command value for matching the voltage and phase of the ship AC power with the voltage and phase of the ship AC power, and outputs a pulse width modulation (PWM) signal according to the synchronization adjustment command value. The generated pulse width modulation signal is output to the gate of each switching element of the second power conversion unit 26.
The droop control unit 28b suppresses the cross current between the ship power supply control units 14A to 14E by aligning the respective droop characteristics of the ship power supply control units 14A to 14E after the synchronization adjustment control by the sync adjustment control unit 28a is completed. Perform droop control. The droop control detects a reactive current and an active current of the marine vessel AC power output from the second power conversion unit 26 and performs voltage droop (droop) control and frequency droop (droop) control.

The voltage droop control calculates an output voltage command by referring to the output voltage calculation map shown in FIG. 3 based on the detected reactive current.
Here, in the output voltage calculation map of FIG. 3, the horizontal axis represents the reactive current detection value Id, the vertical axis represents the output voltage Vo, and when the reactive current detection value Id is zero, the output voltage Vo becomes the maximum voltage Vomax, As the reactive current detection value Id increases from zero, the output voltage Vo is set to gradually decrease according to a characteristic line L11 having a predetermined downward sloping slope ΔV (about 1/100%).

Therefore, in the voltage droop control, when the reactive current detection value Id increases, the output voltage Vo decreases, which causes the reactive current detection value Id to decrease, and the balance function is exerted.
The frequency droop control calculates an output frequency command by referring to the output frequency calculation map shown in FIG. 4 based on the detected effective current.
Here, in the output frequency calculation map of FIG. 4, the horizontal axis represents the active current detection value Iq, the vertical axis represents the output frequency fo, and when the active current detection value Iq is zero, the output frequency fo becomes the maximum frequency fomax, As the active current detection value Iq increases from zero, the output frequency fo is set to gradually decrease according to the characteristic line L12 of a predetermined downward sloping gradient Δf (about 1/100%).

Therefore, in the frequency droop control, when the active current detection value Iq increases, the output frequency decreases, which decreases the active current detection value Iq, thereby exerting the balance function.
Therefore, as schematically shown in FIG. 2, for example, by making the droop characteristics of the ship power supply control units 14A and 14B uniform, the cross current Ic between the ship power supply control units 14A and 14B is suppressed, and the ship power supply control unit 14A. And 14B currents Ia and Ib can be balanced. When the five ship power supply control units 14A to 14E are connected in parallel as in the present embodiment, the currents can be balanced in all the ship power supply control units 14A to 14E.

Next, a method for supplying power to the ship will be described with reference to the flowchart shown in FIG.
First, when the ship is not docked at the wharf, the input breaker 12 and the output breaker 16 of the ship land power supply system 10 are open. Further, the input side switches SWiu to SWiw of the ship power supply control units 14A to 14E, the output side switches SWou to SWow, SWfu to SWfw of the input side noise filter circuit 23 and the output side noise filter circuit 27, and the initial charging circuit 24. The switches SWcu to SWcw are controlled to be in the open state, and the pulse width modulation signals to the first power conversion unit 23 and the second power conversion unit 26 are controlled to be in the supply stop state.

In this state, when the ship docks at the wharf to moor and needs to supply the system power of the onshore system power supply 11, the circuit breaker provided in the power receiving facility connected to the system power supply in the ship is used. In the open state, the power receiving facility and the power supply unit 17 for a ship are connected by a power cable.
When it is confirmed that the work of connecting the power cable is completed, and the start command is input to the system controller 18 (step S1), the input circuit breaker 12 is turned on (step S2), and then the ship power controller 14A. The switches SWcu to SWcw of the initial charging circuit 24 of 14E are closed (step S3). As a result, the terrestrial grid AC power of the shore grid power supply 11 passes through the input circuit breaker 12, is stepped down by the input side transformer 13, passes through the input terminals tiu to tiw of each of the ship power supply control units 14A to 14E, and the initial charging circuit. 25, the smoothing capacitor Cc is charged, and when the DC power is established, the input side switches SWiu to SWiw and the switches SWfu to SWfw of the input side noise filter circuit 23 are closed, and the switches SWcu to SWcw of the initial charging circuit 24. To open.

Next, the output breaker 16 is turned on (step S4). By turning on the output circuit breaker 16, the in-ship AC power of the ship passes through the power cable, the ship power supply unit 17, the output circuit breaker 16 and is stepped down by the output side transformer 15 to be supplied to the ship power supply control units 14A to 14E. It is supplied to the movable contacts of the output side switches SWou to SWow through the output terminals tou to tow.
Next, the pulse width modulation signal is supplied from the internal controller 25 of all the ship power supply control units 14A to 14E to the first power conversion unit 23, and the pulse width modulation signal is supplied from the internal controller 28 to the second power conversion unit 26. Yes (step S5). As a result, in each of the ship power supply control units 14A to 14E, the three-phase low-voltage AC power in which the AC power of the land system power supply 11 has been stepped down by the input-side transformer 13 in the first power conversion unit 23 is converted into DC power. The DC power of the first power conversion unit 23 is converted into the three-phase AC power for ships by the second power conversion unit 26, passes through the output noise filter circuit 27, and becomes fixed contacts of the output switches SWou to SWow. Supplied. In this state, the output side switches SWou to SWow maintain the open state, so that the AC power for the ship and the AC power in the ship are not mixed together.

Next, in each of the ship power supply control units 14A to 14E, the voltage and phase of the ship AC power supplied to the output side switches SWou to SWow are detected by the first voltage detection unit 29, and the ship AC power is detected. The voltage and phase are detected by the second voltage detector 31, and the detected voltage and phase of the ship AC power and the detected voltage and phase of the ship AC power are input to the AD conversion input terminal of the internal controller 28. Therefore, in the synchronization adjustment control unit 28a of the internal controller 28, the second power conversion unit so that the voltage and phase of the marine AC power output from the second power conversion unit 26 match the voltage and phase of the marine AC power. 26 is controlled for synchronization adjustment (step S6).

Next, it is determined whether or not the synchronization adjustment control by the synchronization adjustment controller 28a is completed (step S7). When the result of this determination is that the synchronous adjustment control is not completed, the process waits until the synchronous adjustment control is completed, and when the synchronous adjustment control is completed, the output side switches SWou to SWow of all the ship power source control units 14A to 14E. Is turned on to supply both the ship AC power and the ship AC power to the load of the ship (step S8).
In this combined state, in each of the ship power supply control units 14A to 14E, the droop control unit 28b performs the output voltage droop control and the output frequency droop control on the second power conversion unit 26 (step S9). By this droop control, the droop characteristics of the ship power supply control units 14A to 14W connected in parallel are aligned, the cross current between the ship power supply control units 14A to 14E is suppressed, and the ship power supply control units 14A to 14E are suppressed. Perform parallel operation with balanced current.

After that, by adjusting the governor of the generator installed in the system power supply in the ship, the speed of the generator is reduced, the phase of electromotive force is delayed, the load sharing of the generator is gradually reduced, and the load of the generator is reduced. When the sharing becomes less than the predetermined value, the ship side generator circuit breaker is opened (step S10). As a result, the power supply from the in-ship system power supply to each load in the ship is shut off (step S11), and switched to the ship AC power supplied from the ship land power supply system 10 (step S12). This completes the power supply control process.

On the other hand, when the ship leaves the port with the ship AC power being supplied from the ship shore power supply system 10 to each load in the ship, the shore power supply stop process shown in FIG. 6 is executed.
In the onshore power supply stop process, first, the generator of the system power supply in the ship is started to bring the shipboard generator circuit breaker into the low speed operation state (step S21). Next, the governor of the generator is adjusted to increase the speed of the generator to advance the phase of the electromotive force, thereby gradually increasing the load sharing of the generator and transferring the load to the generator (step S22).
Next, when the load sharing of the generator becomes equal to or greater than a predetermined value, the output circuit breaker 16 of the onshore power supply system 10 for a ship is opened (step S23). As a result, the load sharing of the onshore power supply system for a ship 10 is separated, and the switching to the in-ship system power supply is completed.

Next, the output side switches SWou to SWow of all the ship power supply control units 14A to 14E are cut off, the input side switches SWiu to SWiw are cut off, and further, the first of all the ship power supply control units 14A to 14E. The supply of the pulse width modulation signal to the power conversion unit 23 and the second power conversion unit 26 is stopped (step S24).
Then, finally, the input circuit breaker 12 of the marine shore power supply system 10 is shut off to stop the operation of the marine shore power supply system 10.
As described above, according to the first embodiment, the in-ship system power supply of the ship to be moored is connected to the ship power supply section 17 via the power cable, and then the output breaker 16 is turned on to thereby supply the in-ship system power supply. The AC power in the ship is reduced by the output side transformer 15 and drawn into the ship power supply control units 14A to 14E. Then, the voltage and phase of the in-ship AC power are detected, and the voltage and phase of the ship AC power output from the second power converter 26 are detected.

Then, the synchronization adjustment control unit 28a performs the synchronization adjustment control on the second power conversion unit 26 so that the voltage and phase of the ship AC power match the voltage and phase of the ship AC power. Then, when the voltage and phase of the ship AC power match the voltage and phase of the ship AC power and the synchronization adjustment control is completed, the output voltage droop control and output of the second power converter 26 by the droop controller 28b. By performing the frequency droop control, the droop characteristics of the ship power supply control units 14A to 14E connected in parallel are made uniform, and the parallel operation is performed while suppressing the cross current.

During this droop control, the load distribution of the in-ship system power supply is gradually reduced and then the in-ship system power supply is disconnected from the load, so that the in-ship system power supply can be transferred to the ship's onshore power supply system without instantaneous power failure or disturbance. Load transfer can be performed.
Moreover, the in-ship system power supply is connected to the ship power supply unit 17 of the ship land power supply system 10 via a cable, and the in-ship system power supply is simply supplied to the ship power supply control units 14A to 14E. It is possible to generate marine AC power that matches the voltage and phase of the marine AC power. Therefore, the load transfer from the marine system power supply to the marine onshore power supply system can be performed easily and accurately in a short time.

On the contrary, when the load is transferred from the onshore power supply system 10 for a ship to the system power supply in the ship, by starting the generator of the system power supply in the ship and increasing the speed from the low speed rotation state, the load sharing becomes light to heavy. The load can be transferred easily and accurately in a short time only by shutting off the output circuit breaker 16 in a state where the load is controlled.
In addition, in the said 1st Embodiment, although the case where several ship power supply control parts 14A-14E were connected in parallel was demonstrated, it is not limited to this, and the parallel number of ship power supply control parts is two. It can be set to any number above .

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, a high-voltage ship power supply control unit is applied instead of the low-voltage ship power supply control unit.
That is, in the second embodiment, as shown in FIG. 7, a plurality of n high-voltage ship power supply control units 60A to n (where n is an arbitrary integer, n=5 is set in this embodiment) are used. 60E is connected in parallel. Each of the marine vessel power supply control units 60A to 60E includes an input side transformer 61 and a plurality of m number of the input transformer 61 (m is a multiple of 3 and is set to m=9 in the present embodiment). It is composed of a plurality m of unit inverters 62a to 62i individually connected to the secondary winding and an internal controller 63 that drives these unit inverters 62a to 62i.

The primary winding of the input side transformer 61 is connected to the input terminals tiu to tiw via the input side switches SWiu to SWiw. Then, the input terminals tiu to tiw of each of the ship power supply control units 60A to 60E are connected to the land system power supply 11 via the input circuit breaker 12.
As shown in FIG. 8, each of the unit inverters 62a to 62i has a first power conversion unit CN1, a smoothing capacitor C, and a second power conversion unit CN2 connected in series.
The first power conversion unit CN1 is composed of a bridge circuit in which two six diodes D1 to D6 are connected in series. The first power converter CN1 converts the AC power of the land system power supply 11 input from the input side transformer 61 into DC power.

The second power conversion unit CN2 is composed of a bridge circuit in which two four transistors Q11 to Q14 are connected in series, and a freewheeling diode is connected in antiparallel to each of the transistors Q11 to Q14. The second power conversion unit CN2 is for converting DC power output from the first power conversion unit CN1 into AC power, and an output terminal from the connection point of the transistors Q11 and Q12 and the connection point of the transistors Q13 and Q14. Has been derived.
Each of the unit inverters 62a to 62i is divided into three groups, the outputs of which are connected in series for each group, one ends of which are connected in series are connected to each other as a neutral point, and the other end of the three-phase AC is equivalent to one phase of alternating current. I'm trying to get the output.

The three-phase AC power output from each of the unit inverters 62a to 62i is output to the output terminals tou to tow via the output-side noise filter circuit 64 and the output-side switches SWou to SWow, as in the first embodiment described above. It is connected.
The output terminals tou to tow of the ship power supply control units 60A to 60E are connected to the ship power supply unit 17 via the output-side transformer 15 and the output circuit breaker 16 as in the first embodiment.
Here, the internal controller 63 includes the synchronization adjustment control unit 63a and the droop control unit 63b as in the first embodiment described above.

Therefore, in the synchronization adjustment control unit 63a, the voltage and phase of the marine vessel AC power output from the unit inverters 62a to 62c, 62d to 62f, and 62g to 62i of the three groups are matched with the voltage and phase of the vessel AC power. Performs synchronization adjustment control.
The droop control unit 63b detects the reactive current and active current of the ship AC power, and based on the detected reactive current detection value and active current detection value, the output voltage calculation map of FIG. 3 and the output frequency of FIG. 4 described above. The output voltage Vo and the output frequency fo are calculated with reference to the calculation map.
Then, the droop control unit 63b generates a pulse width modulation signal for controlling the unit inverters 62a to 62c, 62d to 62f, and 62g to 62i based on the calculated output voltage Vo and output frequency fo, and the generated pulse width modulation signal. Is output to the gates of the transistors Q11 to Q14 of the unit inverters 62a to 62c, 62d to 62f and 62g to 62i.

Thereby, the output voltage droop control and the output frequency droop control are performed, the droop characteristics of the ship power supply control units 60A to 60E are aligned, and the cross current between the ship power supply control units 60A to 60E is suppressed, and each ship is controlled. This enables parallel operation in which the currents of the power supply control units 60A to 60E are balanced.
In this 2nd Embodiment, the input side noise filter circuit, the initial charging circuit, and the 1st electric power converter are abbreviate|omitted, and each ship power supply control part 60A-60E has the input transformer 61 and several m unit inverters 62a-. Since it has the same configuration as that of the above-described first embodiment except that it is configured by 62i, the initial charging process of step S3 is omitted in the flowchart of FIG. 5 of the above-described first embodiment. Power can be supplied to the ship in the flow chart.

Therefore, also in the second embodiment, it is possible to obtain the same effects as the first embodiment described above, and it is possible to simplify the configuration excluding the unit inverters 62a to 62i.
Also in the second embodiment, the parallel number of the ship power supply control units can be set to an arbitrary number of 2 or more .

DESCRIPTION OF SYMBOLS 10... Land power supply system for ships, 11... Land system power supply, 12... Input breaker, 13... Input transformer, 14A-14E... Ship power supply control part, 15... Output side transformer, 16... Output breaker, 17 Power supply unit for ship, 18... System controller, 22... Input side noise filter circuit, 23... First power conversion unit, 24... Initial charging circuit, 25... Internal controller, 26... Second power conversion unit, 27... Output side Noise filter circuit, 28... Internal controller, 28a... Synchronous adjustment control section, 28b... Droop control section, 29... First voltage detection section, 31... Second voltage detection section, 60A-60E... Ship power supply control section, 61... Input transformer, 62a to 62i... Unit inverter, 63... Internal controller, 63a... Synchronous adjustment control section, 63b... Droop control section

Claims (9)

A plurality of ship power supply control units for converting grid AC power input from a land grid power supply into ship AC power;
And a marine vessel power supply unit for supplying via a cable marine AC power outputted from the plurality of marine vessel power supply control unit to the marine vessel in the system power supply of the ship at anchor,
Each the marine vessel power supply control unit,
A power conversion unit that converts the input system AC power into the ship AC power,
A synchronization adjustment control unit that performs synchronous adjustment control of the power conversion unit so that the voltage and the phase of the marine AC power output from the power conversion unit match the voltage and the phase of the in-ship AC power.
And a droop control unit for performing load transfer from the in-ship system power supply while droop controlling the power conversion unit when the synchronization adjustment control of the synchronization adjustment control unit is completed. Power system. An input side circuit breaker connected between the system power supply and the ship power supply control unit,
A transformer connected between the ship power supply control unit and the ship power supply unit,
The marine land power supply system according to claim 1, further comprising at least an output-side circuit breaker connected to a secondary side of the transformer. The power conversion unit converts system AC power input from a land-based system power supply into DC and has a first power conversion unit having a smoothing capacitor on the output side, and DC power output from the first power conversion unit. A second power conversion unit for converting the power into AC power for ships, and the power supply control unit for ships is provided with an initial charging circuit for initial charging the smoothing capacitor in parallel with an input side switch. The land power supply system for a ship according to claim 1 or 2. The ship marine power control unit, said filter circuit including a resistor and a capacitor between the input switch and said first power conversion unit is connected via a filter switching device, the filter switching device is the initial The marine shore power supply system according to claim 3, wherein the charging circuit is controlled to be in an open state during operation. The power conversion unit converts system AC power input from a land-based system power supply into DC and has a first power conversion unit having a smoothing capacitor on the output side, and DC power output from the first power conversion unit. And a second power conversion unit for converting the ship into AC power for ships,
The ship power supply control unit is connected between an input side switch connected between an input terminal to which system power is supplied and the first power conversion unit, and between the power conversion unit and the output terminal. An output-side switch, a first voltage detector that detects a first voltage on the power converter side of the output-side switch, and a second voltage that detects a second voltage on the output terminal side of the output-side switch. And a detection unit,
The synchronization adjustment control unit matches the voltage and the phase of the first voltage detected by the first voltage detection unit and the second voltage detected by the second voltage detection unit with the output side switch opened. 3. The land power supply system for a ship according to claim 1, wherein the power conversion unit is controlled so as to be synchronously adjusted. The power converter includes an input-side transformer having a plurality of m (m is a multiple of 3) secondary windings in a primary winding, and a plurality of input-side transformers individually connected to the secondary windings of the input-side transformer. It consists of m unit inverters that output single-phase AC power, and each unit inverter is divided into 3 groups, the output of each group is connected in series, and one end of the series connection is connected to each other as a neutral point. The marine land power supply system according to claim 1 or 2, which is configured to obtain an AC output for one phase of a three-phase AC from the other end. A plurality of the ship power supply control units are connected in parallel, and the droop control unit of each ship power supply control unit arranges the droop characteristics of the ship power supply control unit to suppress cross current between the ship power supply control units. The land power supply system for a ship according to any one of claims 1 to 6, wherein droop control is performed. The input side is connected to the onshore system power supply via the input circuit breaker, the output side is connected to the system power supply for the vessel via the output circuit breaker and the ship power supply unit, and the marine power supply converts the system AC power into the ship AC power. A plurality of control units are connected in parallel, and each ship power supply control unit includes a power conversion unit that converts system AC power into ship AC power, and an output-side switch that is connected to the output side of the power conversion unit. Prepare,
Connecting the vessel power supply to the vessel power supply unit of the vessel moored via a cable,
A step of closing the input circuit breaker and the output circuit breaker in a state where the output side switch is in an open state,
The marine vessel AC voltage output from the power converter of the output side switch and the inboard marine voltage input from the vessel of the output side switch are detected, and the voltage and the phase of the marine vessel AC power are the same. A step of synchronously adjusting and controlling the power conversion unit so as to match the voltage and phase of the inboard AC power input from the ship;
When the synchronous adjustment of the voltage and the phase by the synchronous adjustment control is completed, the output side switch is closed and then the droop characteristics of the respective ship power control units are aligned with the power conversion unit for the ship. A step of performing a droop control for suppressing a cross current between the power supply control units,
Power supply method for a ship, characterized in that said sequentially reduce the load sharing of the ship in the system power supply and a step of blocking the vessel in the system power source. In a state where the ship power supply control unit is supplying ship AC power to the load of the ship, the step of starting the ship system power supply, sequentially increasing the load sharing of the ship system power supply,
And a step of opening the input circuit breaker after shutting off the output circuit breaker and stopping the operation of each of the ship power supply control units when the ship power supply is able to cover the load of the ship. The method for supplying power to a ship according to claim 8, further comprising:

Images